Roasting oven



ROASTING OVEN Filed March 29, 1929 6 Sheets-Sheet l gnvantou Feb. 17, 1931. w. 1.. PHILLIPS ET AL ROASTING OVEN 1929 6 Sheets-Shet 2 Filed March 29.

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ROASTING OVEN Filed March 29, 1929 e Sheets-Sheet 5 Feb. 17, 1931.

w. L. PHILLIPS ET AL I 1,793,009

RQASTING OVEN Filed March 29, 1929 6 Sheets-Sheet 6 atto'u ew Patented as;

wmrmzu 1.1mm m James a.

wan. noose rnonuc-rs comm, ZPOBATION or nnnawm Y application filed March as, 1929. s rial 1m $51,016.

This invention relates to roasting ovens such as are used parching cofiee, cereals and the like.

In roasting coffee able that a uniform heat be applied thereto 5 and also that the beconstantly moved to prevent scorching. It is accordingly one.

of the objects of our invention to provide an oven construction wherein the grains arecontinuously moved thru a tortuous passage.

' Another object is to combine with the oven an automatically controlled fuel feeding debecome mixed therewith.

Other objects of our invention be apparent to those skilled in the art to which it appertains .as the description of the invention proceeds.

With these objects the invention consists in a roasting oven provided with a prolonged sectional passageway, with the several sections Iocated'in difierent. horizontal planes, combined with -'means,' such spiral conveyors, ing. 7 connecting the with the recei tion, to the end by gravity iromsection to section;

' The invention iurther consists in such an oven combined with a source oi fuel, prefer ably g'as, a burner or burners therefor and means, automatically. controlled perature of the oven, iorf V p to said burners. The invention stlll further consists in such a furnace combined with an automatic ventilating apparatus, also controlled by the temperature of-the oven, to

g'end of the next lower sec prevent the temperature of the even from i and cereals it is desir-f cooling device to draw the heat as -for' continuously conveyf the materialto roasted, and delivery end of each section:

that the material be losing t is by theftem-, ceding the. fuel roas'rme oven.

rising to point that or nonsroli, AssrGirons- 'r'o m INCOBYOBATED, or novna,-nnnawm,ncon- I would scorch they; 1

grams. Preferably the automatic ventila H tor is combined with the automatic feed and :hiel control valve, to the end that theymay QODJOmtIY-md automatically act to regulate the oven temperature. .To this end'both the fuel valve and the ventilator are under-the,

column of compressed air, whereby the fuel valve 1s moved towards closed positionv and the ventilator simultaneously moved to-;

wards its open position. This compressed air column. is regulated, preferably through asuitable valve, by a thermostat. exposed to oventemperature and operatively connected to said valve. Furthermore, the invention consists in aroasting oven combined with a I cooling device to which the roasted material control of a suitable, powerdevice, such as a is continuously fed at-the delivery end of the v oven,,which cooling device is also provided from the roasted grams.

One embodiment of the shown for the purpose accompanying drawings, but it is to be exwithmeans for separating foreign matter inventive idea is of illustration in the.

or illustration only and are not designed to define-thelimits of the invention, reference "being had to the appended claim tor this purpose. :In said drawings Fig, 1- is aside elevation -of the improved roaster showing the arrangement of. ,tomatic' heat controls and ventilators,'as well as the air circulators. Y

roaster showin of athe tortuous passage.

- ifFig. s1 eseetisiifnaview enemasseveral up the tortuous pass 6;

removing foreignmatenala Fig. 2 is. a central vertical section of the the entrance and outlet end v theauhis a view similarto Fig. 2 b ut shown mg the; oppo to end and a driv ngpower mechanism yfor the Fig. 7 is an end view of the cooling unit showing the mounting of the concentric tubes.

The internal construction of the roaster may be best described by having reference to Figs. 2, 3 and 4, wherein 10 designates a base or foundation adapted to support the entire apparatus which includes a housing 11 having -arcuate side portions 12. In this housingis a supportin frame 13 adapted to receive aplurality 0 tubes 14 located in different horizontal planes and which are here shown as being vertically disposed one above the other. However, these tubes may be staggered with respect to each other if desired to present a larger area for direct heating. The frame 13 may comprise upright member 14' and cross bars 15 each of which latter forms a support for a pair of rollers or bearings 16 mounted to rotate on stub shafts 17 carried by blocks 18. Each tube 14 carries a plurality of flanges or rings 20, having an annular smooth track 21 to travel on the rollers 16 and a geared portion 22. The tubes 14 may have such length as may be required to provide suitable capaclty or roasting area. Obviously the number of frames 13 provided depends on the span or length of the tubes 14, but they should be so spaced as to provide adequate support for the tubes to prevent any sag.

Referring to Figs. 3 and 4 a power unit 25, thru a gear train or reduction gears 28, rotates a shaft 26, turning in bearings carried by the lower cross bars 15 of the frames 13. Preferably the shaft 26 extends'the entire length of the tubes 14 and it has thereon a pinion gear 27 adjacent each frame 13. These pinions mesh with the gears 22 of the lowermost tube 14. Each succeedingly higher gear 22 meshes with the one'just below, so that the entire series of tubes are rotated in alternate directions by the shaft 26.

Each tube 14 has means, here shown as a spiral conveyor 30, to feed the material therethrough, see Figs. 2 and 3. This spiral convegor is secured to the inner surface of the tu e, but preferably the conveyor blade is not quite as wide as the radius of the tube, leavin a central longitudinal opening thru the tufie. As the tube is rotated the grains will roll and tumble along the tube and conveyor, being gradually conveyed the full length of the tube. Any desired number of perforations 31 may be made in the wall of the tube 14 to permit circulation of heated air currents. An inlet chute 33 is provided whereby a stream of the material to be roasted is constantly fed into the top tube of the series. The rotation conveys the material to the end of this tube whence it falls by gravity through an elbow 34 to the next lower tube through which it travels in the reverse direction and is delivered to the next lower tube. The speed of rotation of the tubes and the number especially noted and the fact that the and'length of the tubes may be varied at will to obtain a period of travel for the material which at the proper roasting temperature will give the re uired degree of parching. The simplicity o the arrangement may be material treated moves by ravity from tube to tube of the roaster is 0% material advantage.

Fig. 4 shows the housing 11 as merging with the frame 13 near the top thereof and, as seen in Figs. 2 and 3, a covering 40 spaced somewhat above the top tube 14 completely encloses the frames and tubes to form the roasting oven. At spaced intervals along the cover 40 are arranged vents 41 leading to an exhaust manifold 42 to which are connected pipes 43 thru which a forced draft is drawn by the fans 44. Each of the vents 41 is provided with a closure member or valve 45 which is shown as upwardly closing.

The fuel pipes 48 are shown at each side of the housing. Gas is preferably used, although other fuels are optional. The fuel from this pipe supplies the various burners which will now be described. The heating mechanism is seen in Fig. l and includes the fuel inlets 50 from the fuel line 48, hand valve 51, automatic valve 52 and forced draft feed 53, leading to the burner 54. A suitable number of these burners may be arranged along the oven as desired. The amount of fuel may be manually controlled by the valves 51, but preferably is controlled by the automatic valve 52 by means of a thermostatic regulator. This regulator comprises a pipe line 55 leading from a source of compressed air to a position along the oven. It

as branch lines 56, each having a valve 57 and thermostat 58 therein. This thermostat is operated by means of a leader 59 placed in the wall 12 of the housing 11 at a point where the average temperature may be encountered. Thus, changes in temperature of the oven actuate the thermostat to control the flow of compressed air thru the pipes 56.

The automatic valve 52 is connected operatively to the compressed air line 61 from the thermostat 58 and is opened or closed by variation from any set temperature. The closure member 45 is also arranged to be operated by the compressed air from the thermostat thru the pipe 61. Thus, when the temperature of the oven exceeds that set on the regulator, the feed of fuel isthrottled down by the valve 52 and the closure member45 is allowed to drop open to permit the escape of the heated air 1n the oven. It is to be understood that any suitable fuel may be used and that the thermostat may be autuated by hydraulic pressure or otherwise as desired. Fig. 4 shows deflectors 62 to prevent the direct force of the burned flame from striking the lower tube. A chaff pan is shown at 63 located below the tubes.

The parched material is discharged at 35 from the lower tube. It is thenat a high temperature and must be cooled. The cooling unit is shown in Figs. 6 and 7 and comprises a frame carrying rollers 71 upon which the cylinder 72 is adapted to rotate. This cylinder 72 may be driven from one of tliepinion gears 27 on the shaft 26 by means of the ring or flange 73. The outlet 35 of the roasting oven is shown as discharging into the cylinder 72 which is preferably somewhat larger in diameter than the tubes 14 and is of suflicient size to receive the baffle or spiral conveyor 75. This spiral is somewhat similar to the spiral 30 but has a central perforated strainer or sleeve 76 which is concentric with the cylinder 72.

An exhaust 1ine-77 connects with the perforated sleeve 76 whereby a draft is maintained thru the openings 78 in the cylinder 72 to cool the material and is drawn thru the perforations in the sleeve 76. Small pararranged along each side of said chamber 0 posite the lowermost conduit, means shiel mg said last named conduit from said burners, a series of ventilator openings from said chamber above the upper conduit, valves controlling said openings, fuel valves controlling the supply of fuel to the burners, a series of thermostats within the opposite sides of the chamber above the level of the lowermost conduit and the burners, and a series of fluid-pressure conduits each simultaneously controlling a fuel valve and a ventilator valve and in turn controlled by one of said thermostats.

In testimony whereof we have signed this specification.

, WILLIAM L. PHILLIPS.

JAMES R. NEAL.

ticles of chaff may be drawn out by this means. A branch line 80 of the exhaust 77 connects with the discharge chute 81 to aid in further cooling the material as it passes from the cylinder 72.

The discharge 81 leads to a pneumatic conveyor 82 which is operated with a greater draft than the exhaust thru the sleeve 76. The draft of air for this conveyor is also drawn thru the openings 78 in the cylinder 72. A trap door or pan 85 is arranged in the discharge 71 and is pivoted at 86 and retained closedby a counterweight 87. Thus if heavy foreign materials should be mixed with the treated material they are not lifted by the pneumatic conveyor 82 but are allowed to accumulate on the pan 85 until they overbalance the counterweight '87, whereupon the pan tilts and allows this foreign material to slide into the receptacle 88. The counterweight 87 immediately closes the trap and the flow of roasted material is resumed. A

chaff pan 89 is disposed under the cylinder By proper adjustment ,ofthe thermostat the fuel valve can be opened at the desired temperatures, and the ventilator be correspondingly actuated to the end that a substantially uniform temperature is maintained in the oven. y It will be readily appreciated b those skilled in the art that various modi cations of the construction herein shown may be made without departing from the invention defined in the'claim.

What is claimed is:

In a roasting oven, the combination of a chamber, a series of intergeared grain-conducting-conduits arrangedone above the other' within and in open relation with said chamber, means supplying grain to be roasted to the upper conduit, means conducting the grain downward from each conduit to the one next below, a series of fuel burners 

